just switched to 300k in the center diff, seemed to help some but i think im going to put heavy fluid in front, like 50k (30k now) and get some new hpi road tires, now i got proline cf and they are not belted so that could be a big part of the problem, but anyway just ran it with charged packs and the lvc kicked in at like ten minutes of running, mainly speed runs in short grass, not the best runtime but once i get another set of batterys itll be ok, id say its in the 30 mph range easy maybe more, so far i am pretty impresed with this set up, but then again ive never witnessed high end , plus i have not driven it since thanksgiving so happy to be running